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Norovirus, which causes severe stomach pain, nausea, diarrhea and vomiting, is now the leading cause of stomach distress, or acute gastroenteritis, in U.S. children. This is the finding of a new study published in The New England Journal of Medicine.  The study estimates that norovirus infection leads to 14,000 hospitalizations, 281,000 emergency room visits, and 627,000 outpatient visits a year.

Image: Toilet paper, via Shutterstock